Possible, but not recommended. Paint forms a film which is likely to
blister. I've found wax to be the best finish for cast iron, either boot
polish or blacking. Clear wax works well on blasted fireplaces but I'd
abandon the white idea if you're going to burn stuff in it.
About the only finish that stands real heat is vitreous enamel. It just
depends how hot - if the glass melts, then even that is a dead duck.
Probably the next best thing is some form of epoxy paint. But you will
need to source it especially I suspect.
Cerllose car paint is the next best thing. Cars get pretty hot in the
sun - over 100C surface on some. In some climates. It seems to hold up
I've seen this done, but never successfully. If you look around car
restoration suppliers (Frost ?) you'll find aerosol "exhaust paint" in
a range of colours, including white. This is probably the best option
you'll find, but it isn't perfect.
White will also turn yellow with heat.
An angle grinder and flap wheels (not disks) to 120 grit will give a
reasonable silver, which you can then wax. This is the lightest
"survivable" colour you're likely to achieve.
Die Gotterspammerung - Junkmail of the Gods
Blimey, when I think of the happy(?) hours I've spent over the years
trying to remove paint from cast iron fireplaces... next we'll be
getting posts asking how to put a flat surface on panelled doors!
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